Trolley-head.



110.785,37@ PATENTBD MAR. 21, 1905. E. J. PARKEME L. N. GOLWELL.

TROLLEY HEAD.

MPLIOATIQN FILED APR. 27. 1904.

Fics;

I INVENTORS mazgwt ATTO Fe N EY UNITED STAT-Es Patented March ai, 1905.

PATENT OEEICE.

EUGENE J. PARKER AND LOUIS N. COLWELL, OF PROVIDENCE, RHODE ISLAND.

TROLLEY-H EAD.

SPECIFICATION forming part of Letters Patent No. 785,372, dated March21, 1905.

Application filed April 27, 1904. Serial No. 205,180.

To {L7/Z whom, it may concern:

Be it known that we, EUGENE J. PARKER and Louis N. CoLwELL, citizensofthe United States, residing at Providence, in the county of Providenceand State of Rhode Island, have invented a certain new and usefulImprovementinTrolley-Heads, of which the following is a specification,reference being had therein to the accompanying drawings.

Our invention relates to trolley heads or casings for trolley-wheels andcommonly known as trolley-harps, and has for its purposeimprovedfacilities for substituting new for old wheels, means forpermitting a variation of the plane of the wheel during the passage ofcurves, and an improved means of uniting the end of the harp andtrolley-pole.

To the above ends our invention consists in the novel structure andcombination of parts hereinafter described, and illustrated in theaccompanying drawings, wherein- Figure 1 is a side elevation of the newtrolley-head, showing in broken lines a contactspring and trolley-wheel;and Fig. 2, a transverse section of the same on line .r x of Fig. l,indicating by dotted lines one of the side Walls in open position.

Like reference-numerals indicate like parts throughout the views.

The body 1 of the trolley-head carries the side members 2 3. One of thesides, 3, is pivoted at its lower extremity by the pintle 4 and carriesa contact-spring 5. Mounted in the body opposite the latter is thesecond contactspring 6. The side members are provided with oblonghorizontal openings 7 7', in which are loosely carried the ends of thespindle 8. The spindle carries upon both ends washers 9 9 and upon oneend a Cotter-pin 10. Openings 11 11 in the springs 6 and 5,respectively, allow passage for the spindley therethrough. The removalof the Cotter-pin and contiguous washer releases the hinged member 3,permitting the latter with its contact-spring to swing free of thespindle and permit the exchange ofthe trolley-Wheel mounted thereon. Thebody terminates in a shank 12, having longitudinal slits 13 in its lowerportion. Both the body and shank is traversed by a cylindrical opening14, whose upper diameter is enlarged at 15 to form an internal annularshoulder 16.

The trolley-pole 17 embraces the tubular shank 12 and is held inengagement with the latter by the following mechanism: A shaft 18,vertically mounted in the head, has a conicalshaped lower extremity 19,projecting slightly below the end of the shank 12 and having a maximumdiameter in excess of the interior diameter of the shank. The upperportion of the shaft is threaded at 2O and has mounted thereon a nut 21,revoluble in the opening 15 and resting upon the shoulder 16. The upperportion of the nut is'provided with a socket 22 to allow ingress of asocket-wrench to operate the nut when desired. It is obvious that as thenut 21 is turned the shaft 18 rises, simultaneously forcing by thetapered extremity 19 the slitted portion of the shank 12 outwardly intofrictional contact with the inner surface of the trolley-pole 17.

Having described our invention, what we claim is-f 1. In a trolley-head,the combination with the body of a trolley-arm mounted upon the body,and expanding means carried by the body for frictionally engaging thebody and pole.

2. In a trolley-head, the combination with the body provided with asplit shank of a trolley-pole embracing said shank,- and means withinthe body for expanding the split shank into engagement withthetrolley-pole.

3. In a trolley-head, the combination with the body provided with atubular split shank of a trolley-pole embracing said shank, a shaftprovided with an inclined extremity traversling the shank, and means inthe head and engaging the shaft for elevating the shaft and expandingthe shank.

In testimony whereof we have axed our signatures in presence of twowitnesses.

EUGENE J. PARKER. LOUIS N. OOLWELL. Witnesses:

HoRA'rIo E. BELLows, HENRY C. GAGNER.

